QuantConnect/Lean
Lean Algorithmic Trading Engine by QuantConnect, a C# and Python library for developing and backtesting trading strategies.
C#
Backend & APIs
API Frameworks
Apache-2.0
17.6K
Stars
4.5K
Forks
Nov 28, 2014
Created
Mar 4, 2026
Last Updated
Project Analytics
Stars Growth (1 Month)
+1.3K
+8.1% change
Avg Daily Growth (1 Month)
+47.0
stars per day
Fork/Star Ratio (All Time)
25.7%
High engagement
Lifetime Growth
4.3
stars/day over 4.1K days
Stars Over Time
Forks Over Time
Open Issues Over Time
Pull Requests Over Time
Commits Over Time
Topics
AI-Generated Tags
algorithmic-trading
finance
forex
trading-strategies
stock-indicators
backtest
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